Lightbox is displaying a scroll bar from the underlying page!

Can anyone help? This is killing me. http://artificialdaylight.com/new2/index.php?id=3

I have a div with an overflow:auto scroll bar. Inside this div is a call to my Lightbox slide show (the "VIEW SLIDE SHOW" link). When clicked, the slide show opens, but the scroll bar from the underlying page is visible through it. I can’t figure out how to hide it. I want it to function like this page. http://artificialdaylight.com/new/index.php?id=3

Any advice? Thanks.

This appears to be a bug with Firefox. Safari, IE, and Netscape all display properly.

There’s no problem under Firefox 3 that I can see